LENGTH ADJUSTABLE BRACE

Abstract: The present invention relates to a longitudinally adjustable brace comprising telescopically adjustable concentric tube units, whereby the brace comprises at least two concentric, in each other, in a longitudinal direction movable, arranged tubes (5, 7), that a turnable arranged machine receiving unit (17) is arranged to the outer tube, along which unit a machine bracket (21) is continuously movable.

Description: LENGTH ADJUSTABLE BRACE. DESCRIPTION Technical field The present invention relates to a longitudinally adjustable brace, particularly suitable for operation using a machine for making holes in concrete. The object of the present invention is to obtain a longitudin¬ ally adjustable brace, which is readily movable, is adjustable with regard to its length, and by means of which a machine for making holes in concrete can be manoeuvred and controlled in a simple way. Background of the invention At the making of holes in walls, in particular in walls of con¬ crete, for pipe lead-throughs , such as rearrangement of tap wa¬ ter piping systems or heat piping systems, or re- and new draw¬ ing of electrical cables, an operation on an exact level is often required, often close to a ceiling, and most often with a perpendicular application to the wall present. At the making of holes in a concrete wall the working time is often long and the work should be carried out from a fixed member in order to eli¬ minate load damages , in order to obtain an even result and a high quality of the performance. It has previously been proposed that a boring machine, a machi¬ ne for making holes, shall be mounted onto a brace and that the work shall be carried out in connection hereto. Presently available braces do not, however, allow work from a floor le¬ vel, but one has to work from a platform close to the boring machine in order to feed the same. Further, presently available braces have been immobile, and the boring machine has to be mounted onto the brace after having applied the brace between e.g. a floor and a ceiling. A boring machine for this purpose has a considerable weight and thus it is heavy and complicated to mount this from a platform. Demands have thus been raised for a simple and rational brace. Description of the present invention It has now surprisingly been shown possible to be able to solve these demands by means of the present invention which is cha¬ racterized in that the brace comprises at least two concentric, in each other, in a longitudinal direction movable, arranged tubes, that a turnable arranged machine receiving unit is ar¬ ranged to the outer tube, along which unit a machine bracket is continuously movable. Further characteristics are evident from the accompanying claims . By means of the present invention there is obtained that the brace can be easily adjusted by means of the concentric, visavi each other movable tubes and that a boring machine mounted to said unit can be easily manoeuvred and controlled. As said unit is turnable arranged any desired boring angle can be applied. The present invention will now be described in more detail with reference to the attached drawing, wherein FIG 1 shows a preferred embodiment seen from the side, FIG 2 shows the embodiment of FIG 1 from the side, turned 90 visavi FIG 1 , and FIG 3 shows the embodiment of FIG 1 seen from above along the line III-III of FIG 2. 1 denotes a bottom stand provided with wheels, where on or more of the wheels 2 are preferably individually breakable and which stand advantageously comprises four to five wheels 2. In order to be able to reach close to a wall or other object the bottom stand 1 can be asymmetrically designed having shorter and long¬ er wheel legs 3. To the bottom stand 1 a tube 4 is fixedly ar¬ ranged which tube 4 receives a movable, but lockably arranged tube 7 therein. The tube 7 can be locked by tightening of a bolt 6 arranged in the tube 4 , whereby the upper part of the tube 4 is being slotted both in longitudinal direction as well as in cross direction at its periphery in order to obtain a re¬ duction of the diameter of the tube 4 at the tightening, and thereby to obtain a locking of the tube 7 in longitudinal di¬ rection in the tube 4. The tube 7 is further advantageously provided with a bolt 24 which in a similar way may provide for a reduction of the diameter for locking of the tube 7 vertical¬ ly and sidewise to an inner concentric tube 5. The tube 5 is on its one side provided with a gear element 26 along all its pe¬ riphery. Concentric with, and outside tube 5 the second tube 7 is arranged which tube 7 in its upper part is provided a turn- able gearing or pinion 8 meshing with said gear element 26, which gearing 8 is manoeuvred by means of a crank 9. Concentric with and inside the tube 5 there is a third tube or pole 10 with a dish 11 attached thereto. The tube 10 is movable in the tube 5 and can be locked by tightening of a bolt 12 which in co-operation with peripherally and crosswise extending slots provides for a reduction of the diameter and thereby a locking of the tube 10 in any desired position in relation to the tube 5. To the tube 7 on its side opposite to the gearing a fourth tube 13 arranged, longitudinally movable but lockingly arranged by means of collars 27 and 28 provided with bolts. On and along this tube 13 a tube shaped bracket 14 movably arranged, which bracket 14 can be locked by means of a bolt 15. The bracket 14 comprises, perpendicular to its longitudinal direction a shaft socket 16 to which a machine receiving unit 17 is arranged. The shaft socket 16 is slotted in longitudinal and crosswise direc¬ tions as well, and provided with a bolt 25 for obtaining a re¬ duction of the diameter thereof. Said unit 17 comprises a shaft 18 , which is turnable mounted in said bracket 16 and can be locked in any desired angle by tightening the bolt 25 there, and in this embodiment provided with a carrying shaft 19 in the form a double tube 19 provided with gears 20 on its one side. To the double tube 19 a machine bracket 21 is arranged which machine bracket 21 is movably arranged along the double tube 19 by means of a pinion 22 arranged cross the gears 20. The present invention functions in accordance with the follow¬ ing. A concrete boring machine (not shown) provided with a drill sleeve for making holes is placed onto the machine brac¬ ket 21 and the stand is moved up to the intended site. The wheels 2 are locked. By displacing the tube shaped bracket 14 along the tube 13 the distance between the top dish 11 and the boring machine so that the desired distance between the ceiling and the intended hole is obtained. Hereby the positioning of the bracket 14 on the tube 13 can be adjusted, the tube 10 of the top dish 11 in the tube 5 can be adjusted so that a correct distance is obtained. Subsequent thereto the bolt 6 is loosened and by turning the crank 9 the tube 7 is moved downwardly and reaches the bottom onto a floor plane or the similar. Then the bolt 6 is tightened once again, the bolt 27 is unlocked and the bolt 28 is tightened, whereby the tube 13 is displaced with the tube 5 when it is cranked upwardly, and the cranking continues, whereby the tube 5 is displaced upwardly inside the tube 7 un¬ til it reaches the ceiling or another plane with its top dish 11. In that position the boring machine is started and by turn¬ ing the pinion 22 the machine bracket 21 is displaced along the double tube 19. When operation of the boring machine takes place at a high level a prolonged crank is used to turn the pi¬ nion 22, and thus the work can take place from a floor or ground level. When the boring is finished the pinion 22 is turned in the opposite direction and the bore core can be rea¬ dily removed. By turning the machine bracket 21 after loosening the bolt 25 the bore core can be made sliding out of the bore sleeve. The bolt-cramping collar 27 may also be tightened simultaneous¬ ly as the bolt 28 is loosened, whereby the tube 13 remains locked to the outer tube 7 and the machine unit 17 does not ac¬ companies the inner tube 5 at the upward cranking of the brace. The device according to the invention can also be used for mak¬ ing holes in a ceiling by either turning the machine bracket up, or by arranging the brace between two walls.

Claims: CLAIMS 1. Longitudinally adjustable brace comprising telescopically adjustable concentric tube units, characterized in that the brace comprises at least two concentric, in each other, in a longitudinal direction movable, arranged tubes (5,7), that a turnable arranged machine receivinq unit ( 17 ) is arranged to the outer tube, along which unit a machine bracket (21) is con¬ tinuously movable. 2. Brace according to claim 1, characterized in that it com¬ prises a bottom stand (1) provided with wheels. 3. Brace according to any of claims 1-2, characterized in that the inner tube (5) is provided with a gear element (26) which co-operates with a gearing (8) mounted to the outer tube (7). 4. Brace according to any of claims 1-3, characterized in that the machine receiving unit (17) comprises a carrying shaft (19' provided with gears (20) and the machine bracket (21) displace- ably arranged along said carrying shaft { 19 ) with a pinion (22) . 5. Brace according to any of claims 1-4, characterized in that the inner tube (5) in its upper part receives a telescopically arranged tube (10) provided with a dish (11). 6. Brace according to any of claims 1-5, characterized in that the machine receiving unit (17) is movably arranged to the ou¬ ter tube (7) along the same. 7. Brace according to any of claims 1-6, characterized in that the machine receiving unit ( 17 ) is movably arranged to a mo¬ vable, lockable member (13) which is arranged either to be dis¬ placed with the inner tube (5) at the displacement of this, or to be locked to the outer tube (7) at the displacement of the inner tube ( 5 ) .

Inventors: HANSSON TORGNY, HANSSON, TORGNY
Applicants: HANSSON TORGNY, LAHOLM BYGGTEKNIK, BYGGTEKNIK I LAHOLM AKTIEBOLAG, HANSSON, TORGNY
Application year: 1994
Main classification: B25D17
IPC codes: B25H1